Power-driven hammer



A ril 29, 1952 s. THOMPSON POWER-DRIVEN HAMMER Filed on. s, 1950 IN V EN TOR.

5 am Dam/=30 Patented Apr. 29, 1952 UNITED STATES PATENT OFFICE POWER-DRIVEN HAMMER Sam Thompson, Houston, Tex.

Application October 6, 1950, Serial No. 188,728

2 Claims. 1

This invention relates to a power-driven hammer.

An object of this invention is to provide a power-driven hammer which is adapted for use in metal working, wherein it is oftenv necessary to work in locations not permitting the swinging of an ordinary hand-actuated hammer.

Another object of this invention is to provide a power-driven hammer which is particularly adapted for use in automobile body working and repair shops, wherein it is necessary to raise small indentations found on automobile panels in ordinarily inaccessible locations.

A further object of this invention is to provide a hammer which is particularly adapted for attachment to and actuation by a source of motive power of the type usually found in metal working shops, such as the ordinary drill motors.

A still further object of this invention is to provide a power-driven hammer which is relatively compact and of a size and weight facilitating the grasping of the hammer in the hand for movement to a location where the hammer is to be employed.

A still further object of this invention is to provide a power-driven hammer which is relatively simple in structure and cheap to manufacture.

The above and still further objects and advantages of the invention will become apparent upon consideration of the following detailed description of the invention when taken in conjunction with the accompanying drawings, wherein:

Figure 1 is a side elevational view of the powerdriven hammer of the present invention;

Figure 2 is a sectional elevational view of the power-driven hammer shown in Figure 1;

Figure 3 is a sectional view taken along the line 3-3 of Figure 1, showing a hammer-actuating cam in one position of its rotary movement;

Figure 4 is a sectional view taken substantially along the line 4-4 of Figure 1, showing the hammer-actuating cam in another position of its rotary movement; and

Figure 5 is an enlarged fragmentary sectional view showing the actuating cam inengagement with the cam track.

' Referring now more particularly to the draw ings, wherein like reference numerals have been used throughout the several views to designate like parts, there is shown the power-driven hammer of the present invention, generally designated by the reference numeral I0, which is adapted for attachment to a source of motive power, not shown, by means of a power shaft H.

The hammer to embodies a body l2 having a work-engaging face 3. The body I2 is provided with a longitudinally extending bore l4 which has one'end terminating in, or passing through, the work-engaging face i 3 and has the other end terminating adjacent to and spaced from the opposits face H of the body l2. A counterbore i6 is provided in the body l2 and extends from the opposite face thereof toward and terminating in communication with the bore H.

Positioned contiguous to the exteriorly opening end of the bore l 4 is an anvil which is loosely mounted within the bore for movement into engagement with a piece to be worked, the anvil being generally designated by the reference numeral H and including an anvil pin l8 and a head IS. The anvil H is supported within the bore H by means of an exteriorly threaded collar which threadedly engages the bounding wall of the bore ll, the ,collar being provided with a longitudinally extending bore for the extension therethrough of the pin ll! of th anvil I1.

Positioned within the bore I4 in end-to-end relation with respect to the anvil I1 is a hammer shaft 22 which is mounted for periodic movement into and out of engagement with the head IQ of the anvil II, to thereby urge the anvil against the piece to be worked and to impart hammering blows thereto.

Bridging the open end of the counterbor l6 and supported against the opposite face l5 of the body 12 is a closure cap 23 which includes a depending, exteriorly threaded sleeve 24 threadedly engaging the counterbore 16. The cap 23 is provided with a centrally disposed circular opening 25 for the extension therethrough of a guide pin- 26 which is positioned longitudinally of and within the counterbore l5 and fixedly secured to the adjacent end of the hammer shaft 22.

Positioned interiorly of the counterbore l6 and circurnpo's'ed about the guide pin 26 is a coil spring 21 for urging the hammer shaft into its position of movement into engagement with the head i! of the anvil l1.

Positioned transversely within the body I2 and spaced from one side of the hammer shaft 22 is an actuating shaft 28 which has one end terminating exteriorly of the body l2 and threaded, as designated by the reference numeral 29, for engagement with the power shaft ll, the powershaft being connected to the source of motive power. The actuating shaft 23 is journaled within the bore provided transversely of the body H. The bore 30 terminates in an enlarged,

interiorly threaded counterbore 3| in which is supported a plug 32 provided with an axially dis-' posed seat 33 for rotatably supporting a cylindrical extension 34 carried by the adjacent end of the actuating shaft 28. The plug 32 is provided with a longitudinally extending opening 35 having one end terminating in communication with the seat 33, the shaft opening 35 providing means for introducing a lubricant into the body for lubricating the hammer shaft 22 and the actuating shaft. 7 The side face of the hammer shaft 22 contiguous to the actuating shaft 28 is cutaway to form a flat surface 36 which is provided with a longitudinally extending cam track 37. by the actuating shaft 28 is a camming element 38 which is engageable in the cam track 31 for periodically urging the hammer shaft 22 out of its position of engagement with -.the anvil I! in response to the rotary movement of the actuating shaft 28. To maintain the hammer shaft 22 against rotation, a guide bushing 39 is supported on the actuating shaft 28 and engages the flat surface 36 of the hammer shaft-22. 1':-

In actual use, the threaded end 29 of the actuating shaft 28 is connected t-o-the power shaft II, the latter being connected toya SOlllCG'Of motive power. Upon effecting the rotary movement of the actuating shaft 28, the hammer shaft 22 will be urged out of engagemnt with the anvil against the oppositely acting force provided by the resilient element 21. When the cammingelement 38 is rotated to a position wherein it is no longer in engagement within the cam track 37, the hammer shaft 22 will be urged back into ,engagement with the anvil I! to thereby-urge. the latter against the piece to be worked with an impacting force. The intensity of the hammering blows will be determined by the type of spring employed for biasing the hammer-shaft into engagement with the anvil.

.Although only one embodiment of the powere driven hammer of the present invention hasbeen described, it is readily apparent that numerous modifications can be made without departing from the spirit of the invention. as setforth in the appended claims.

What I claim is:

1. A hammer adapted for attachment to a source of motive power comprising a body having a wor -engaging face, there being a longitudinally extending bore provided in said body having one end terminating in said work-engaging face and having the other endterminatingaadjacent toand spaced from the-opposite face of said body, therebeing a counterbore extending inwardly from said opposite face of said body in communication with said bore, an anvil positioned contiguous to one end of said. bore andlooselyrnounted therein for movementjinto engagement with a piece to be worked, a hammer shaft positioned within said bore and mounted therein for periodic movement into and outof engagement with said anvil to thereby urge thelatter against the piece to be worked and to impart hammeringblows thereto, a closure cap bridging theopen end of said counterbore and supported against said opposite face of said body, a guide pin having one end extending through said closure cap into .said counterbore and fixedly secured to said hammer shaft, resilient means positioned interiorlyof said counterbore and supported on said guide pin for urging said hammer shaft into its position of movement in engagement.;with; said -anvil, an actuating shaft positionedtransversely within said body and spacedfromone side face of said Carried hammer shaft and having one end terminating exteriorly of said body and provided with means for connection to said source of motive power, said one side face of said hammer shaft being cut away to form a flat surface, there being a longitudinally extending cam track provided within said fiat surface, a camming element carried by said shaft and engageable in said cam track for periodically urging said hammer shaft out of its position of engagement with said anvil in response to the rotary movement of said actuating shaft, and a guide bushing supported on said actuating shaft and engaging said flat surface for maintaining said hammer shaft against rotation. V

2. A hammer adapted for attachment to a source of motive power comprising a body having a work engaging face, there being a longitudinally extending bore provided in said body having one end terminating in said work engaging face and having the other end terminating adjacent to and spaced from the opposite face of said body, there being a counterbore extending inwardly from said opposite face of said body in communication with said bore, an anvil positioned contiguous to one end of said bore and loosely mounted therein for movement into engagement with the piece to be worked, a hammer shaft positioned within said bore and mounted therein for periodic movement into and out of engagement with said anvil to thereby urge the latter against the piece to be worked and to impart hammering blows thereto, a closure cap bridging the open end of said counterbore and supported against said opposite face of said body, a guide pin having one end extending through said closure'cap into said counterbore and fixedly secured to said hammer shaft, a coiled spring circumposed about said guide pin and bearing against said cap and the adjacent end of said hammer shaft for urging said hammer shaft into its position of movement into engagement with said anvil, an actuating shaft positioned transversely within said body and spaced from one side face of said hammer shaft and having one end terminating exteriorly of said body and provided with means for connection to a source of power. said one side face of said hammer shaft being cut away to form a flat surface, there being a longitudinally extending cam track provided within said fiat surface, a camming element carried by said shaft and engageable in said cam track for periodically urging said hammer shaft out of its position of engagement with said anvil in response to the rotary movement of said actuating shaft, means carried by said actuating shaft and'engaging said flat surface for maintaining said hammer shaft against rotation, and-av lubricating plug'carried by-said body and in communication with the other end of said actuating shaft and said bore for lubricating said hammer shaft and said actuating shaft.

- SAM THOMPSON.

REFERENCES CITED -The followi g references are of record in the file of this patent: v

UNITED STATES PATENTS 

